<?php
// smtp类
class Smtp extends Singleton
{
  /* Public Variables */
  public $smtp_port;
  public $time_out;
  public $host_name;
  public $log_file;
  public $relay_host;
  public $debug;
  public $auth;
  public $user;
  public $pass;

  /* Private Variables */
  private $sock;

  /* Constractor */
  public function __construct($user, $pass, $relay_host = "", $smtp_port = 25, $auth = true)
  {
    $this->debug = FALSE;
    $this->smtp_port = $smtp_port;
    $this->relay_host = $relay_host;
    $this->time_out = 30; //is used in fsockopen()
    #
    $this->auth = $auth; //auth
    $this->user = $user;
    $this->pass = $pass;
    #
    $this->host_name = "localhost"; //is used in HELO command
    $this->log_file = "";

    $this->sock = FALSE;
  }

  // 邮件发送主体函数
  public function smtp_mail($to, $from, $subject = "", $body = "", $mailtype = 'HTML', $cc = "", $bcc = "", $additional_headers = "")
  {
    $header = '';
    $mail_from = $this->get_address($this->strip_comment($from));
    $body = preg_replace("/(^|(\r\n))(\\.)/", "\\1.\\3", $body);
    $header .= "MIME-Version:1.0\r\n";
    if ($mailtype == "HTML") {
      $header .= "Content-Type:text/html\r\n";
    }
    $header .= !empty($to) ? "To: " . $to . "\r\n" : "To: " . SMTP_RECIEVER . "\r\n";
    if ($cc != "") {
      $header .= "Cc: " . $cc . "\r\n";
    }
    $header .= "From: $from<" . $from . ">\r\n";
    $header .= "Subject: " . $subject . "\r\n";
    $header .= $additional_headers;
    $header .= "Date: " . date("r") . "\r\n";
    $header .= "X-Mailer:By Redhat (PHP/" . phpversion() . ")\r\n";
    list($msec, $sec) = explode(" ", microtime());
    $header .= "Message-ID: <" . date("YmdHis", $sec) . "." . ($msec * 1000000) . "." . $mail_from . ">\r\n";
    $TO = explode(",", $this->strip_comment($to));

    if ($cc != "") {
      $TO = array_merge($TO, explode(",", $this->strip_comment($cc)));
    }

    if ($bcc != "") {
      $TO = array_merge($TO, explode(",", $this->strip_comment($bcc)));
    }

    $sent = TRUE;
    foreach ($TO as $rcpt_to) {
      $rcpt_to = $this->get_address($rcpt_to);
      if (!$this->smtp_sockopen($rcpt_to)) {
        $this->log_write("Error: Cannot send email to " . $rcpt_to . "\n");
        $sent = FALSE;
        continue;
      }
      if ($this->smtp_send($this->host_name, $mail_from, $rcpt_to, $header, $body)) {
        $this->log_write("E-mail has been sent to <" . $rcpt_to . ">\n");
      } else {
        $this->log_write("Error: Cannot send email to <" . $rcpt_to . ">\n");
        $sent = FALSE;
      }
      fclose($this->sock);
      $this->log_write("Disconnected from remote host\n");
    }

    return $sent;
  }

  /* Private Functions */

  function smtp_send($helo, $from, $to, $header, $body = "")
  {
    if (!$this->smtp_putcmd("HELO", $helo)) {
      return $this->smtp_error("sending HELO command");
    }

    #auth
    if ($this->auth) {
      if (!$this->smtp_putcmd("AUTH LOGIN", base64_encode($this->user))) {
        return $this->smtp_error("sending HELO command");
      }
      if (!$this->smtp_putcmd("", base64_encode($this->pass))) {
        return $this->smtp_error("sending HELO command");
      }
    }
    #
    if (!$this->smtp_putcmd("MAIL", "FROM:<" . $from . ">")) {
      return $this->smtp_error("sending MAIL FROM command");
    }

    if (!$this->smtp_putcmd("RCPT", "TO:<" . $to . ">")) {
      return $this->smtp_error("sending RCPT TO command");
    }

    if (!$this->smtp_putcmd("DATA")) {
      return $this->smtp_error("sending DATA command");
    }

    if (!$this->smtp_message($header, $body)) {
      return $this->smtp_error("sending message");
    }

    if (!$this->smtp_eom()) {
      return $this->smtp_error("sending <CR><LF>.<CR><LF> [EOM]");
    }

    if (!$this->smtp_putcmd("QUIT")) {
      return $this->smtp_error("sending QUIT command");
    }

    return TRUE;
  }

  function smtp_sockopen($address)
  {
    return empty($this->relay_host) ? $this->smtp_sockopen_mx($address) : $this->smtp_sockopen_relay();
  }

  function smtp_sockopen_relay()
  {
    $this->log_write("Trying to " . $this->relay_host . ":" . $this->smtp_port . "\n");
    $this->sock = @fsockopen($this->relay_host, $this->smtp_port, $errno, $errstr, $this->time_out);
    if (!($this->sock && $this->smtp_ok())) {
      $this->log_write("Error: Cannot connenct to relay host " . $this->relay_host . "\n");
      $this->log_write("Error: " . $errstr . " (" . $errno . ")\n");
      return FALSE;
    }
    $this->log_write("Connected to relay host " . $this->relay_host . "\n");
    return TRUE;;
  }

  function smtp_sockopen_mx($address)
  {
    $domain = preg_replace("/^.+@([^@]+)$/", "\\1", $address);
    if (!@getmxrr($domain, $MXHOSTS)) {
      $this->log_write("Error: Cannot resolve MX \"" . $domain . "\"\n");
      return FALSE;
    }
    foreach ($MXHOSTS as $host) {
      $this->log_write("Trying to " . $host . ":" . $this->smtp_port . "\n");
      $this->sock = @fsockopen($host, $this->smtp_port, $errno, $errstr, $this->time_out);
      if (!($this->sock && $this->smtp_ok())) {
        $this->log_write("Warning: Cannot connect to mx host " . $host . "\n");
        $this->log_write("Error: " . $errstr . " (" . $errno . ")\n");
        continue;
      }
      $this->log_write("Connected to mx host " . $host . "\n");
      return TRUE;
    }
    $this->log_write("Error: Cannot connect to any mx hosts (" . implode(", ", $MXHOSTS) . ")\n");
    return FALSE;
  }

  function smtp_message($header, $body)
  {
    fputs($this->sock, $header . "\r\n" . $body);
    $this->smtp_debug("> " . str_replace("\r\n", "\n" . "> ", $header . "\n> " . $body . "\n> "));

    return TRUE;
  }

  function smtp_eom()
  {
    fputs($this->sock, "\r\n.\r\n");
    $this->smtp_debug(". [EOM]\n");

    return $this->smtp_ok();
  }

  function smtp_ok()
  {
    $response = str_replace("\r\n", "", fgets($this->sock, 512));
    $this->smtp_debug($response . "\n");

    if (!preg_match("/^[23]/", $response)) {
      fputs($this->sock, "QUIT\r\n");
      fgets($this->sock, 512);
      $this->log_write("Error: Remote host returned \"" . $response . "\"\n");
      return FALSE;
    }
    return TRUE;
  }

  function smtp_putcmd($cmd, $arg = "")
  {
    if ($arg != "") {
      $cmd = $cmd == "" ? $arg : $cmd . " " . $arg;
    }

    fputs($this->sock, $cmd . "\r\n");
    $this->smtp_debug("> " . $cmd . "\n");

    return $this->smtp_ok();
  }

  function smtp_error($string)
  {
    $this->log_write("Error: Error occurred while " . $string . ".\n");
    return FALSE;
  }

  function log_write($message)
  {
    $this->smtp_debug($message);

    if ($this->log_file == "") {
      return TRUE;
    }

    $message = date("M d H:i:s ") . get_current_user() . "[" . getmypid() . "]: " . $message;
    if (!@file_exists($this->log_file) || !($fp = @fopen($this->log_file, "a"))) {
      $this->smtp_debug("Warning: Cannot open log file \"" . $this->log_file . "\"\n");
      return FALSE;
    }
    flock($fp, LOCK_EX);
    fputs($fp, $message);
    fclose($fp);

    return TRUE;
  }

  function strip_comment($address)
  {
    $comment = "/\\([^()]*\\)/";
    while (preg_match($comment, $address)) {
      $address = preg_replace($comment, "", $address);
    }

    return $address;
  }

  function get_address($address)
  {
    $address = preg_replace("/([ \t\r\n])+/", "", $address);
    $address = preg_replace("/^.*<(.+)>.*$/", "\\1", $address);

    return $address;
  }

  function smtp_debug($message)
  {
    if ($this->debug) {
      echo $message . "<br>";
    }
  }

  function get_attach_type($image_tag)
  { //

    $filedata = array();

    $img_file_con = fopen($image_tag, "r");
    unset($image_data);
    $image_data = '';
    while ($tem_buffer = AddSlashes(fread($img_file_con, filesize($image_tag))))
      $image_data .= $tem_buffer;
    fclose($img_file_con);

    $filedata['context'] = $image_data;
    $filedata['filename'] = basename($image_tag);
    $extension = substr($image_tag, strrpos($image_tag, "."), strlen($image_tag) - strrpos($image_tag, "."));
    switch ($extension) {
      case ".gif":
        $filedata['type'] = "image/gif";
        break;
      case ".gz":
        $filedata['type'] = "application/x-gzip";
        break;
      case ".htm":
        $filedata['type'] = "text/html";
        break;
      case ".html":
        $filedata['type'] = "text/html";
        break;
      case ".jpg":
        $filedata['type'] = "image/jpeg";
        break;
      case ".tar":
        $filedata['type'] = "application/x-tar";
        break;
      case ".txt":
        $filedata['type'] = "text/plain";
        break;
      case ".zip":
        $filedata['type'] = "application/zip";
        break;
      default:
        $filedata['type'] = "application/octet-stream";
        break;
    }
    return $filedata;
  }
}